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`Iuly 25, 1933. H ROSENBERG 1,919,863

DAMPER Filed Aug. 20, 1951 gmwrm N B ERE,

Patented July 25, 1933 l UNITED i STATI-:s

HEYMAN ROSENBERG, 02E?` NEW YORK, IN2-YY,

DAMPER Applicationiled August 20, 1931. Serial N0. 558,411. i

This inventionrelates to improvements'in those features of damper construction relating to the'mode vof mounting and method of A fao operation, and the primary object in view is the simplification and reduction in cost of dampers while improving eliicacy of operation.l

`With this and further objects in view, the

invention includes in combination with a damper platemeans for adjusting the damper angularly, 'means'for guiding the movement of the parts in their adjustment, and

means for clamping the severalparts in any of various adjusted positions.

In greater detail, the invention includes an operating lever or handle having a sleeve adapted to surround a damper rod, an annulus surrounding the rod and providing a bearing forfthe sleeve, and means for clampinor the sleeve and annulus in anyposition of parts seen in Figure 1, the damper plate and bearing rodsvbeing seen in elevation.

Figure 3 isan enlarged, detailed'elevation of the serrated face of theannulus.

Referringto the drawing by numerals,.1 indicates a flue, chimney, or other duct or passage whose draft is to be controlled, and 2 indicates the Vdamper plate which, of course,

preferably conforms'to the cross section of the flue 1, and is of suficiently reduced circumference to swing freely within the flue,

a relatively small space being left between the damper.. plate 2 and the inner surface of the flue 1. The plate 2 is sustained by a `damper rod which may be of the conventional form, but is preferably formed of separate pieces fixed to the plate 2, one of said y'tab 5 appropriately fixed, as by riveting,

' it in the direction of the axis of the 'damper "closer than at any other point.

.-and'beyond the cylindrical portion 10 `the bolt 12 engaged by a nut '13 preferably of 'pieces consisting ofvaV rod section 4 outstanding through the fluel 1 and `finding bearing therein and having an enlarged, connecting bolting, or the'likeyto the damper plate 2." 55 The other section of the damper rod consists of a tab 6 similar to tab 5 and preferably detachablyconnected to the plate2 forconvenience of'mounting theplate, a rod sectionV 7 loutstanding from the tfab 'throughV and @o inding'bearing in the wall of the flue 1. Preferably the rod7 isprovided'with in enlarged boss 8 between the tab 6 and the inner vwall ofy the flue' f1, lthe bossV beingl formed with a curved outer face 9,V that is a partiglobular face struck onan arc corresponding to the curvature of the wall of thelue 1, Sothat a Ihorizontal line of contact between said outer face of boss 8 andj the'vflue 1 will atall times'be maintf'tined70 notwithstanding vangular adjustments o f the plate 2, and, therefore, Ywhen theydamper plate 2 is subject to a stress tending to vdraw rod,the outer face of the bossy 8"will serve75 as a resistance wall incontact with the 'inner face of flue 1, andthe damper plate2 will ytherefore not be drawn toward the vrinner surface of the flue 1 at one point appreciably 8O The damper rodv 7 is preferably .formed with a cylindrical portion l0provid1ngthe, bearing engagement with the wall'of flue 1 and outstanding a short distance therefrom,

rod is `formed With'a s uared or other polysided portion 11, and still outward from the portion 11 the rod is formed intoa threaded j the wing-nut type to facilitate manual op-go eration. `Surrounding the cylindricalrpor- Ytion 10 is an annulus H14 conforming at its inner face in vcontour withthe adjacentlcontour of the wall of flue 1 so thatv the inner Y face of the annulus 14 is curved in one d1- rection, as seen in. Figure 1, and relatively straight in the other direction, as seen 1n Figure 2, and the said face of' annulus 14 is preferably 'provided -with serrations or teeth l5, as seen n Figure 3, which are10G ency toward rotary movement.

adapted to slightly embed themselves in the engaged surface of the flue 1 to prevent the annulus from slipping or having any tendthe curvature of the annulus in one direction only will also contribute to preserving the annulus againstrotation, and as a. means of more eliective engagement .the teeth 15 are preferably case-hardened. The annulus 14 is provided with an outstanding, annular boss or hub portionlGL' A sleeve v17 surrounds the extended portion of rod 7 and is provided with a passageway snugly receiving the polysided portion 11, so that the sleeve 17 may move man axial direction on the rod while requiring the rod to move angularly' with angular, movement of the sleeve. The outei end portion of the sleeveA V17 is sufliciently reduced to permit free but. rcomparatively snug passage of the reduced bolt portion 12 oil' rod 7 ,and the nut 13 is located `to engage the outer end of the sleeve vfor stressing the same toward the flue 1 as or lever 18 lextends from the sleeve 17 to facilitate-oscillating or angular adjustment ment of. an appropriate operating cable when of the parts, and an appropriate eye 19v is provided ingsleevel 17 to facilitate. adjustdesired.

The operation is very simple and will be lreadily understood from thev foregoing.

f Tightening nut 13 causes sleeve 17 to clamp annulus 14 againstthe' outer `face of' fine 1,

` -while the boss 8 has its `outer face clampedf overcoming` the friction. between sleeve 17 against, the inner face-of flue 1, andfthus 4 the I parts may, befrictionally locked against 5V movement for retaining damper plate 2 in any given adjusted position. sired to'shift the plate, it the clamping action has not been too severe, the movement ofthe partsmay be accomplished by merely andannulus .14 andbetween boss 8 and Wall vof flue 1i, but ordinarily the operator will loosen baclr on the nut vv13. to allow-freer movement ofthe parts. Ther lever 18 is swung, as required, rod 7 accordingly man- -ually adjusted, and the damper plate 2 -moved therewith to the requirednew position, and then the nut 13 is again tightened,

clampinglthe parts in the new location.

Duringv such annular movement, the en- .larged portion of sleeve 17 will have moved about the boss orhub 16 .asa bearing, and thus prevented any possible lateraly or bend; ing strain on the damper-rod.`v

Naturally,

.When it is de- What is claimed is 1. In damper construction, the combination, with a damper plate and damper rod adapted to outstand through the wall of a flue, of a sleeve slidingly and non-rotatingly engaging the rod, a nut threaded onto the rod beyond the sleeve oreiecting a relatively clamping action between the sleeve and,r damper plate, and an annulus surrounding the rod and providing a. bearing therefor, directly engaging the rod, the annulus also providing a seat for the end of the sleeve.

2. In damper eonstruction, the combination, with a damper plate and damper rod adapted to outstand through the wall of a flue, or" a sleeve slidingly and non-rotatingly engaging the rod, a nut threaded onto the rod beyond the sleeve for effecting a relatively clamping action between the sleeve and. damper plate, and an annulus surrounding the rod and providing` a bearing therefor directly engaging the rod, the annulus having an outstanding hub-like boss extending into and providing bearing for the sleeve, the sleeve extending to and engaging the faceA of the annulus.

3. In damper construction, the combination, with a damper plate and damper rod adapted to outstand .through the wall ot :i liuc, of a sleeve slidingly and non-rotatingliY engaging the rod, a nut threaded onto the rod beyond the sleeve for-effecting a relatively clamping action between the sleeve and damper plate, and an annulus surrounding the rod and providing a bearing therefor directly engaging the rod, the annulus havingy an outstanding hub-like .boss extending intov and providing bearing for the sleeve, the sleeve rextending to and engaging the face of the annulus', said rod having a boss locatedto lie inward of the iiue.

4.111 damper construction, .the combination,l with a damper plate and damper rod adapted to outstand through the wall of a.

flue, of. a sleeve slidingly and non-rotatingly engaging the rod, a nut' threaded onto the rod beyond `the sleeve for effecting a relatively clamping action between the sleeve and damper plate, and an annulus surround-v ing the rod and providing a bearing therefor directly lengaging the rod, the annulus having an outstanding hub-like boss extending into, and providing bearing for the sleeve, the sleeve extending to and engaging the face' of the annulus, the annulus having its face presented toward theiue shaped to contorni kto the engaged surface of the flue and being providedwith serrations, for engaging the ,flue and' resistingv rotation ot theA annulusf HEYMAN ROSENBERG.. 

